00468naa#a2200181#i#450# EN\\bibl\75010 20250513022759.2 2413-046X 20190425b2019####ek#y0engy0150####ca RUS RU Journal article Moscow Electronic science 2019 0 с. Journal article local Chapkina Nadezhda Anatol'evna Mikaelyan Mikael' Varazdatovich e-integral.ru